急性白血病细胞端粒酶活性与细胞周期的关系

The Relationship between Telomerase Activity and Cell Cyele in Acute Leukemia Cells

本研究探讨急性白血病细胞端粒酶活性与细胞周期的关系。采用聚合酶链反应 酶联免疫吸附法 (PCR ELISA)检测了 14 8例急性白血病病人和 36例正常对照的细胞端粒酶活性 ,其中急性非淋巴细胞白血病 (ANLL) 92例 ,急性淋巴细胞白血病 (ALL) 5 6例 ;同时对 16例急性白血病患者和 4例正常对照用流式细胞术测定了细胞周期。结果发现 :①急性白血病患者细胞的端粒酶阳性率为 71.6 % (10 6 14 8) ,显著高于对照组 5 .6 % (2 36 ) ,其中复发组患者端粒酶阳性率为 88.9% (32 36 ) ,初治组 81.3% (6 1 75 ) ,二者显著高于完全缓解组 35 .1% (13 37) ,P <0 .0 5。ANLL 92例 ,端粒酶阳性率为 71.7% (6 6 92 ) ,ALL 5 6例 ,端粒酶阳性率为 71.4 % (40 5 6 ) ,二者之间无显著性差异。②端粒酶阳性组与阴性组细胞周期各期细胞数无显著性差异。结论 :端粒酶激活在急性白血病中极为普遍 ,且端粒酶阳性率的高低与急性白血病病期相关 ,它可能是急性白血病发展过程中白血病细胞增殖旺盛的分子标志。端粒酶活性的表达与各期细胞数无明显相关 ,提示端粒酶活性的表达还受其它生物学因素的调控。

To explore the change of telomerase activity in acute leukemia (AL) cells and its relationship with cell cycle, PCR ELISA was used to detect telomerase activity of bone marrow cells from 148 AL patients, including 92 cases with acute non lymphocytic leukemia (ANLL) and 56 cases with acute lymphocytic leukemia (ALL). Thirty six patients without bone marrow disorders were detected as normal control. The cell cycle of 16 patients and 4 controls was detected with flow cytometry. The results showed that the positive rate of telomerase was 71.6% (106/148) in the cells from AL patients, which was higher than that in the control group 5.6% (2/36). It was 88.9% (32/36) in the relapse group and 81.3% (61/75) in the untreated group. Both rates were higher than that in the CR group (35.1%, 13/37). There was no significant difference in the ALL and ANLL groups. The cell number in various phases of cell cycle had no significant difference between telomerase positive and negative groups. It was concluded that the activation of telomerase was very common in acute leukemia cells. Telomerase positive rate was closely associated with the different stages and progress of acute leukemia, and it might be a molecular marker for increased proliferation of leukemic cells during the process of the disease. Activation of telomeras had no correlation with cell number in different phases of cell cycle, while telomerase activity is modulated by other biological factors in addition to cell cycle.